package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.BizCodeEnum;
import com.atguigu.common.exception.RRException;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.service.WareSkuService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.Data;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    OrderFeignService orderFeignService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    /**
     * 解锁库存方法
     * 1、下单成功，库存页锁定成功，但是接下来的业务失败导致订单回滚，之前锁定的库存就要解锁
     * 2、订单失败，库存服务回滚了，这种情况下库存工作单也没有数据，但是消息队列里有消息
     * <p>
     * 情况1：解锁失败了，但是消息已经消费了。
     * 只要解锁库存失败，一定要告诉服务器不要删除该消息，启用手动确认机制
     *
     * @param skuId
     * @param wareId
     * @param num
     * @param taskDetailId
     */
    private void unLockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        //库存解锁
        wareSkuDao.unLockStock(skuId, wareId, num);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2); //变为已解锁
        orderTaskDetailService.updateById(entity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        /**
         * skuId: 1
         * wareId: 2
         */
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            queryWrapper.eq("sku_id", skuId);
        }

        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) {
            queryWrapper.eq("ware_id", wareId);
        }


        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.size() == 0) {
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字，如果失败，整个事务无需回滚
            //1、自己catch异常
            //TODO 还可以用什么办法让异常出现以后不回滚？高级
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");

                if (info.getCode() == 0) {
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e) {

            }


            wareSkuDao.insert(skuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //select sum(stock-stock_locked) from wms_ware_sku where sku_id=1
            Long count = baseMapper.getSkuStock(skuId);

            vo.setSkuId(skuId);
            vo.setHasStock(count == null ? false : count > 0);
            //查询当前sku的总库存量
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 为某个订单锁定库存
     * <p>
     * 库存解锁的场景
     * 1、下单成功，订单过期没有支付、被系统自动取消、被用户手动取消，都要解锁库存
     * 2、下单成功，库存页锁定成功，但是接下来的业务失败导致订单回滚，之前锁定的库存就要解锁
     *
     * @param vo
     * @return
     */
    @Override
    @Transactional
    public Boolean orderLockStock(WareSkuLockVo vo) {

        //todo 按照收获地址，找到就近仓库，锁定库存。

        //保存库存工作单
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);

        //1.找到每个商品在都哪个仓库有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        //2.锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            Integer num = hasStock.getNum();
            List<Long> wareIds = hasStock.getWareId();
            if (CollectionUtils.isEmpty(wareIds)) {
                //所有仓库都没库存
                throw new RRException(BizCodeEnum.WARE_NO_STOCK_EXCEPTION);
            }
            //如果后面有个库存锁定失败，前面保存的记录就回滚了
            for (Long wareId : wareIds) {
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, num);
                if (count > 0) {
                    skuStocked = true;
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, null, hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(entity);

                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity, stockDetailTo);

                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());

                    lockedTo.setDetail(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", lockedTo);
                    break;
                }
            }
            if (skuStocked == false) {
                //当前商品所有仓库都没有锁成功
                throw new RRException(BizCodeEnum.WARE_NO_STOCK_EXCEPTION);
            }
        }
        return true;
    }

    @Override
    @Transactional
    public void unlockStock(StockLockedTo to) {

        //库存工作单详情
        StockDetailTo detail = to.getDetail();
        Long detailId = detail.getId();

        //解锁
        //1.查询库存工作单存在不存在
        //1.1 存在，证明库存锁定成功了，需不需要解锁还要分情况
        //1.1.1 订单不存在，需要解锁
        //1.1.2 有订单还需要看订单的状态
        //1.1.2.1 订单取消状态，需要解锁库存
        //1.1.2.2 订单其他状态，不需要解锁库存
        //1.2 不存在，库存锁定失败，库存锁定回滚了。这种情况不需要解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null) {
            //解锁
            //库存工作单Id
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();
            R r = orderFeignService.getOrderEntity(orderSn);
            if (r.getCode() == 0) {
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if (data == null || data.getStatus() == 4) {
                    //订单不存在或已经被取消，解锁库存
                    if (byId.getLockStatus() == 1)
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                }
            } else {
                //拒绝消息，重新放回队列，等待下次解锁
                throw new RuntimeException("远程服务失败");
            }
        }
    }

    /**
     * 关闭订单的时候给解锁库存队列发送消息进行解锁库存
     *
     * @param orderTo
     */
    @Override
    @Transactional
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查询最新库存状态，防止重复解锁库存
        WareOrderTaskEntity taskEntity = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = taskEntity.getId();
        //找到所有没有解锁的库存进行解锁
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id)
                .eq("lock_status", 1));

        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }
    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }
}